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spotify_login_handlers.go
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/
spotify_login_handlers.go
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package handlers
import (
b64 "encoding/base64"
"encoding/json"
"fmt"
"io/ioutil"
"net/http"
"net/url"
"strconv"
"strings"
log "github.com/sirupsen/logrus"
"github.com/2beens/spotilizer/constants"
"github.com/2beens/spotilizer/models"
"github.com/2beens/spotilizer/services"
"github.com/2beens/spotilizer/util"
)
var clientID string
var clientSecret string
func SetClientIDAndSecret(cID string, cSecret string) {
clientID = cID
clientSecret = cSecret
}
func GetSpotifyLoginHandler(serverURL string) func(w http.ResponseWriter, r *http.Request) {
return func(w http.ResponseWriter, r *http.Request) {
state := util.GenerateRandomString(16)
util.AddCookie(&w, constants.CookieStateKey, state)
q := url.Values{}
q.Add("response_type", "code")
q.Add("client_id", clientID)
q.Add("scope", constants.Permissions)
q.Add("redirect_uri", fmt.Sprintf("%s/callback", serverURL))
q.Add("state", state)
redirectURL := "https://accounts.spotify.com/authorize?" + q.Encode()
log.Trace(" > /login, redirect to: " + redirectURL)
http.Redirect(w, r, redirectURL, http.StatusFound)
}
}
func RefreshTokenHandler(w http.ResponseWriter, r *http.Request) {
cookieID, err := r.Cookie(constants.CookieUserIDKey)
if err != nil {
log.Debugf(" > refresh token failed, cannot find user by cookie ID, error: [%s]", err.Error())
util.SendAPIErrorResp(w, "Cannot find user by cookie, refresh token failed", 400)
return
}
user, err := services.Users.GetUserByCookieID(cookieID.Value)
if err != nil {
log.Debugf(" > refresh token failed, cannot find user by cookie ID [%s]", cookieID.Value)
util.SendAPIErrorResp(w, "Cannot find user by cookie, refresh token failed", 400)
return
}
log.Traceln(" > refresh token, value: " + user.Auth.RefreshToken)
data := url.Values{}
data.Set("refresh_token", user.Auth.RefreshToken)
data.Set("grant_type", "refresh_token")
newAuthOptions, authErr := getAccessToken(data)
if authErr != nil {
util.SendAPIErrorResp(w, "Internal server error during refresh token. Try again later.", http.StatusInternalServerError)
return
}
user.Auth = newAuthOptions
services.Users.Save(user)
log.Tracef(" > refresh token success for user [%s]", user.Username)
util.SendAPIOKResp(w, "success")
}
func GetSpotifyCallbackHandler(serverURL string) func(w http.ResponseWriter, r *http.Request) {
return func(w http.ResponseWriter, r *http.Request) {
q := r.URL.Query()
loginErr, ok := q["error"]
if ok {
log.Infof(" > login failed, error: [%v]", loginErr)
util.RenderView(w, "error", models.ErrorViewData{Title: "Spotify Login",
Error: "Login to Spotify failed: " + strings.Join(loginErr, ", ")})
return
}
code, codeOk := q["code"]
state, stateOk := q["state"]
storedStateCookie, sStateCookieErr := r.Cookie(constants.CookieStateKey)
if !codeOk || !stateOk {
log.Debug(" > login failed, error: some of the mandatory params not found")
util.RenderView(w, "error", models.ErrorViewData{Title: "Spotify Login",
Error: "Login to Spotify failed: login failed, error: some of the mandatory params not found"})
return
}
if storedStateCookie == nil || storedStateCookie.Value != state[0] || sStateCookieErr != nil {
errDetails := "<empty>"
if sStateCookieErr != nil {
errDetails = sStateCookieErr.Error()
}
log.Debugf(" > login failed, error: state cookie not found or state mismatch. more details: [%s]", errDetails)
util.RenderView(w, "error", models.ErrorViewData{Title: "Spotify Login",
Error: "Login to Spotify failed: state cookie not found or state mismatch"})
return
}
util.ClearCookie(&w, constants.CookieStateKey)
data := url.Values{}
data.Set("code", code[0])
data.Set("redirect_uri", fmt.Sprintf("%s/callback", serverURL))
data.Set("grant_type", "authorization_code")
authOptions, err := getAccessToken(data)
if err != nil {
log.Warn(" >>> login failed, getAccessToken error: " + err.Error())
util.RenderErrorView(w, "", "Login Failed", http.StatusInternalServerError, "Internal server error during login. Try again later.")
return
}
// get user info
log.Debugln(" > getting user info from SP ...")
spUser, err := services.Users.GetUserFromSpotify(authOptions.AccessToken)
if err != nil {
log.Debugf(" >>> error, cannot get user info from Spotify API. Details: " + err.Error())
util.RenderView(w, "error", models.ErrorViewData{Title: "Spotify Login",
Error: "Login to Spotify failed: error, cannot get user info from Spotify API"})
return
}
log.Debugf(" > gotten user [%s]\n", spUser.ID)
if spUser.ID == "" {
util.RenderView(w, "error", models.ErrorViewData{Title: "Spotify Login",
Error: "Login to Spotify failed: error, cannot get user info from Spotify API [spUser.ID nil]"})
return
}
var cookieID string
user, _ := services.Users.Get(spUser.ID)
if user == nil {
cookieID = util.GenerateRandomString(45)
user = &models.User{Username: spUser.ID, Auth: authOptions}
services.Users.Add(user)
services.Users.AddUserCookie(cookieID, user.Username)
log.Debugf(" > new user [%s] created and stored. cookie [%s]", user.Username, cookieID)
} else {
cID, cErr := services.Users.GetCookieIDByUsername(user.Username)
if cErr != nil {
cookieID = util.GenerateRandomString(45)
log.Debugf(" > generating and seding new cookie ID [%s] to client", cookieID)
services.Users.AddUserCookie(cookieID, user.Username)
} else {
log.Debug(" > using previous cookie ID: " + cID)
}
cookieID = cID
user.Auth = authOptions
services.Users.Save(user)
}
util.AddCookie(&w, constants.CookieUserIDKey, cookieID)
GetIndexHandler(user.Username)(w, r)
}
}
func getAccessToken(data url.Values) (auth *models.SpotifyAuthOptions, err error) {
body, err := postReq(data, "https://accounts.spotify.com", "/api/token/")
if err != nil {
return nil, err
}
spLoginError := &models.SpLoginError{}
err = json.Unmarshal(body, &spLoginError)
if err != nil || (len(spLoginError.Error) > 0 && len(spLoginError.ErrorDescription) > 0) {
log.Warn(string(body))
return nil, fmt.Errorf("spotify login error, type [%s], details: %s", spLoginError.Error, spLoginError.ErrorDescription)
}
auth = &models.SpotifyAuthOptions{}
err = json.Unmarshal(body, &auth)
if err != nil {
log.Warn(" >>> error while unmarshaling auth options: " + err.Error())
return nil, err
}
return
}
func postReq(data url.Values, uri string, path string) ([]byte, error) {
u, _ := url.ParseRequestURI(uri)
u.Path = path
client := &http.Client{}
r, _ := http.NewRequest("POST", u.String(), strings.NewReader(data.Encode())) // URL-encoded payload
authEncoding := b64.StdEncoding.EncodeToString([]byte(clientID + ":" + clientSecret))
r.Header.Add("Authorization", "Basic "+authEncoding)
r.Header.Add("Content-Type", "application/x-www-form-urlencoded")
r.Header.Add("Content-Length", strconv.Itoa(len(data.Encode())))
resp, err := client.Do(r)
if err != nil {
return nil, err
}
defer resp.Body.Close()
return ioutil.ReadAll(resp.Body)
}